United States / Build / Lastobond Smooth Seal HT FR self-adhering SBS modified bitumen underlayment

Lastobond Smooth Seal HT FR self-adhering SBS modified bitumen underlayment

Name: Lastobond Smooth Seal HT FR self-adhering SBS modified bitumen underlayment
Brand: Soprema Inc.

This is a listed roofing assembly. Listing 8180-2364:0001. This site cites ASTM E108 / UL 790. Match the model and orientation.

Soprema Inc. listing 8180-2364:0001 in OSFM category 8180. Lastobond Smooth Seal HT FR self-adhering SBS modified bitumen underlayment. Refer to listee's data sheet and UL Roofing Systems Directory for detailed product description and operational considerations.

Kind: listed-assembly. Brand: Soprema Inc.. Listing evidence: OSFM WUI handbook 2026-08-25. Page reviewed 2026-08-26. JSON (CC BY 4.0)

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Documented attributes

Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.

Attribute	Value	Evidence source
Form
Assembly role	roof underlayment	CAL FIRE OSFM Building Materials Listing — 8180-2364:0001 (official-listing · Listing 8180-2364:0001, Description field)Lastobond Smooth Seal HT FR and *Lastobond Reinforced HT FR self-adhering SBS modified bitumen underlayments.

Where this product goes

FA Exhibit ROF-100. The roof system, named

Program	ID / source	Evidence date	Expires	Status
CAL FIRE BML	8180-2364:0001 · Search BML for 8180-2364:0001	2026-08-25	2027-06-30	listed

Tests and programs cited

ASTM E108 / UL 790 · test-method
OSFM BML · listing-program

Specification notes

Listing is from the OSFM WUI handbook. Confirm the live GOVmotus record and the exact model before specification.

Sources

2025 OSFM WUI Listed Products Handbook (2 September 2025) — CAL FIRE OSFM (official). Accessed 2026-08-23.
OSFM Building Materials Listing search — CAL FIRE OSFM (listing-body). Accessed 2026-08-23.

Lastobond Smooth Seal HT FR self-adhering SBS modified bitumen underlayment. FireApproved. https://fireapproved.com/materials/soprema-inc-lastobond-smooth-seal-ht-fr-self-adhering-sbs-modified/. Last verified 2026-08-26.